Die-stock.



I. w. NoNNEIvI/IN.

DIE STOCK.

APPLICATION FILED MAR. 6, |911.

1,228,955. Patented June 5, 1917.

I. W. NONNEMAN.

DIE STOCK.

APPLICATION FILED MAR. 6. 1917.

Patented June 5,1917.

3 SHEETS-SHEET 2.

|.YW. NONNEIVIAN,

DIE STOCK.

APPLICATION FILED IvIAII.6. |917.

1,228,955., Patented June 5, 1917.

3 SHEETS-SHEET 3.

Arras IRA W..NO1\T1\TEMAN, OF WARREN, OHIO, ASSIGNOR TO THE BORDENCOMPANY, 0F WARREN, OHIO, A CORPGRATION 0F OHIO.

DIE-STOCK.

Specification of Letters Patent.

Patented .time 5, 1er?.

Application filed. March 6, 1917. Serial No. 152,458.

To all whom t may concern Be it known that I, IRA lV. NoNNmmN, a citizenof the United States, residing `at lVai-ren, in 'the county of rIrumbulland State of Ohio, have invented a certain new and useful Improvement inDie-Stoeks, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings.

This invention relates to die stocks adapted to cut tapered threads. Theobject is to pro'- vide very simple mechanism carried by the rotatingmember which carries the threadcutting chasers, to effect a recession ofsuch chasers as the thread progresses, thus enabling a tapered thread tobe efficiently and readily cut.

In accomplishing ,this controlled recession of the chaser, I provide acontrolling device on the Chaser-carrying frame which engages in thethread ywhich has just been cut, and, by moving' radially in the frame,coacts with certain mechanism yto allow a corresponding recession of thechaser. My die stock is therefore` self-receding in its nature. thechaser being allowed to play back according` to the thread which it hasitself cut. My invention includes such characteristic broadly and alsothe more specific features of it, as shown in the drawings hereof and ashereinafter more fully explained. The essential characteristics of theinvention are summarized in the claims.

In the drawings, Figure l is a front `elevation of my die stock; Fig. Qis 4an edge view thereof; Fig. 3 is an enlarged section substantially ona radial plane alongside one of the chasers; Fig. l is an enlargedfragmentary view of the face of the die stock with the front plateremoved, showing the parts in the position they occupy before thecutting begins; Fig. 5 is a view of the chaser, the follower, and theabutments detached from'the frame and located in a receded position;Fig. 6 is a somewhat diagrammatic view similar to Fig. 5, but withtheparts in initial position; Fig. 7 is a fragmentary view of a portionof the frame with the parts removed; Figs. 8 and '9 are cross sectionsthrough the frame and the chasers, as indicated by the lines 8MS and 9-9respectively on Fig. 4l; Fig. lOis a perspective view of one of theabutmentblocks removed.

As shown in the drawings, l indicates a revoluble frame having anextended guiding sleeve 2 adapted to carry a bushing 3 surrounding thepipe. The frame is provided with the usual sockets et, for the receptionof handles 5, enabling it to be turned. In the frame are radialguideways 6, and these are covered by plates 7 Ysecured to the frame byscrews 8.

In the radial guideways are chasers l0, of the form shown particularlyin Fig. 3. Each chaser has an inner tapered Cutting edge l1 and itsouter portion is cut away as shown at l2, providing reduced extensions.The cutting away to make these-reduced extensions is done in two planesat an angle to each other to make a V-shaped shoulder on the chaser,asindicated at l5.

20 indicates a follower mounted alongside ofthe cha'ser. The followeris'wider than the chaser, as shown at 21, and occupies an enlargedrecess 9 in the frame just outside of the Chaser-carrying guidew ay. Theinner edge 23 of this follower is formed to enter the thread-groove cutby the Chaserk but is rounded at yits extremeV edge so that it cannotitself eut the pipe. The follower is provided with a V-shaped head at asimilar angle to the shoulder 15 formed on the chaser. The follower andchaser are capable of some independence of movement and both Y coactwith the abutment, hereinafter dcscribed.

30 indicates the 'abutments, of which there are two for each Chaser, andwhich coact therewith and with the follower to control the recedence ofthe chaser. These abutinents are of the form shown perspectively in Fig.10. Each consists of a partially cylindrical block 30 mounted in a cav-`l ity 39 in the frame'so that it may turn about its axis as if pivotedon such axis. The abutment has a cut-away edge 31 providing a shoulder32 against which the inclined shoulder 15 on the chaser bears. Anothercut-k away portion 33 of the abutment provides a shoulder 34C whichbears against the in# clined head 25 of the follower. 35 is stillanother cut-away portion of the abutment,

providing a recess for a spring to seat. et() indicates such a spring,these being set into v cavitiesv 41 in the frame and tending to swingthat end of the abutment bloclrtoward y the chaser.

It will be 'seen particularly from Fig. 6,

o may not be moved by the chaser. On the Y that in the position ofthe-parts where the cutting begins the shoulder 32 engages the Chasershoulder 15 at such point that the thrust indicated by the line from thepoint 32 to the center c of the abutment, is very nearly at right anglesto the plane on the shoulder of the Chaser. In other words, the thrustfrom the Chaser against the abutment is substantially. normal to theplane of the Chaser shoulder. Accordingly the abutment absolutely stopsthe Chaser and other hand, the normal line l1/ from the followershoulder 25 at the point of Chaser engagement at 34:, passes to theouter side of the center of the abutment, and leaves a rotativeComponent indicated by .e in the diagram of forces, and thus the actionof the Chaser on the shoulder 34 tends to turn the abutment outwardly atthat point against the action of the spring ll0. Such outward turningcarries the abutment shoulder 32 downwardly on the V-shaped shoulder ofthe Chaser, and thus allows that Chaser to play back correspondingly.

It results from the Construction described, that, while the ChasercannotI itself shove back against the abutment, the follower may turnthe abutment to allow the Chaser to play back according to the amountthat the follower moves, since the inclines on the head of the followerand on the shoulder of the Chaser are at the same angle. Now as theChaser starts to cut a tapered thread on the pipe A, for example, thefollower travels immediately afterward in adjacent threads, and nothaving a cutting inner edge, it is gradually forced outward by thethread which the Chaser has Cut, and in such outward movement of thefollower the abutments are swung against the action of their springs tocorrespondingly release the Chaser so that it recedes outwardly.Therefore, the Chaser gradually recedes under the control of the threadwhich it has itself Cut, or, in other words, the mechanism describedprovides what may be called a self-recedder, and this line may besomewhat oblique chaser.

could be moved by the Chaser is not reached in the normal recedence ofthe Chaser, while the engagement of the follower is always effective tomove the abutments.

50 in the drawings indicates a pair of stopping pins carried by thefront frame plate 7 and standing in the path of the cutaway portion 33of the abutments, limiting the inward movement of the abutments underthe action of the springs. It is desirable to limit the independence ofmovement between the follower and the chaser. To accomplish this I haveprovided a lug 18 on the Chaser, entering a notch 28 in the follower,Fig. 3. Any suitable detent prevents the Chaser inadvertently droppingout, as for example, the plunger 60 pressed by a spring 61 against thechaser.

It will be seen that the die stock above described is very simple inconstruction and accomplishes the desired recedence of the chaserswithout the necessity of a separate controlling member, either clampedto the pipe or abutting the end of the pipe, as has been heretoforeCustomary. By controlling 'the recedence of the Chaser by abutmentswhich are themselves moved by a follower, all mounted in the singlerotating frame, I simplify the construction and render itmore Compact.

Having thus described my invention, what I claim is:

1. A device for Cutting tapered threads comprising a frame, a recessiveChaser Carried thereby, and means engaging the thread Cut by the Chaserfor Controlling the recession of the Chaser.

2. The combination of a rotatable frame, a Chaser movably mountedtherein, and mechanism adapted to engage the thread being cut on a pipeand revolve about the axis thereof as said frame revolves, saidmechanism Controlling the recession of the chaser.

3. In a die stock, the combination of a revoluble frame, a recessiveChaser carried therebv and formed to cut a tapered thread, a devicerevoluble with the Chaser and adapted to successively engage each turnof has Completed its Cut of suchV turn, and

mechanism Controlled by said device for limi iting the recession of thechaser.

4. The Combination of a revoluble frame,

movable Chasers therein, followers movably mounted along the outer sideof the Chasers and adapted to engage the thread cut, and meansControlled by said followers for limiting the recession of the Chasers.C

5. In a die stock, the combination of a revoluble Chaser frame, a Chasercarried thereby and formed to Cut a tapered thread,

a movable abutment for the Chaser, and a device carried by the frame andadapted to engage the thread Cut by the Chaser and yoperating to'movesaid abutment.V

alongside of the Chaser and adapted to engage the thread which theChaser has Cut, and means whereby the recession of the follower causes amovement of theV abutment to enable recession of the Chaser.

7. In aV die stock, the Combination of ay a tapered thread, an actuatingbar movably mounted in the frame and having a noncutting edge adapted toengage the thread cut by the Chaser, an abutment Comprising a blockrotatively mounted in the frame and having a shoulder limiting theoutward movement of the Chaser and another shoulder adapted to beengaged by said bar.

9. In a die stock, the Combination of a revoluble frame, a ChaserCarried thereby and formed to Cut a tapered thread, a movable abutmentfor the Chaser, a device carried by the frame and adapted to engage the,thread Cut by the Chaser and be moved thereby, means whereby suchmovement moves the abutment to correspondingly release the Chaser, and aspring acting on the abutment and tending to prevent such movement.

10. In a die stock, the combination of a revoluble frame, a Chaserradially mounted therein and having tapered teeth at its inner edge, abar lying parallel with the Chaser radially in the frame and having anon-cutting edge adapted to occupy the thread cut by the Chaserimmediately following the Chaser, a movable abutment mounted in theframe and limiting the outward movement of the Chaser and itself movedby the outward movement of the bar, and a spring tending to hold theabutment against such movement.

ll. In a die stock, the Combination of a revoluble frame, a Chasercarried thereby, an actuating bar carried by the frame and adapted toengage the thread Cut by the Chaser, an abutment Carried by the trame inposition to turn on an aXis said abutment having two shoulders, one ofwhich is adapted to be engaged by said actuating bar whereby theabutment may be turned, said other shoulder `limiting the outwardmovement of the Chaser, and a spring acting on said abutment and tendingto' prevent the turning described. i. 7

l2. In a die stock, the Combination of a revoluble rame, a Chasermovably mounted therein and provided with teeth for cutting a taperedthread and having a V- shaped shoulder, a pair of abutment blocks-"v5lrotatively mounted in the frame and each having a shoulder engaging saidV-shaped shoulder and limiting the outward movement of the Chaser, andan actuating device for said blocks movably mounted in the@ frame andhaving a non-cutting edge adapted to engage the thread Cutv by theChaser.v

.18. In a die stock, the Combination of a revoluble frame, a Chasermounted therein and having a V-shaped shoulder, two rota-' tiveabutments each having a shoulder engaging such V-shaped shoulder on theChaser, an actuating bar Carried by the frame and lying alongside of theChaser and having a V-shaped shoulder, and shoulders on the abutmentsengaging the shoulder of the actuating bar, the abutment radius at theshoulder which engages the Chaser being substantially perpendicular tothe Chaser shoulder1 while the radius at the shoulder 95 which engagesthe bar is more oblique thereto.

14. In a die stock, the combination of a revoluble frame, a Chasermounted therein and having a V-shaped shoulder, two rotative abutmentshaving shoulders engaging such V-shaped shoulder, an actuating barcarried by the frame and lying alongside of the Chaser and having aV-shaped end,

shoulders on the abutments engaging the end of the actuating bar, and apair of springs mounted in the frame and bearing against said abutmentsand pressing them toward the Chaser.

15. In a die stock, the Combination of a frame, a radial guidewaytherein, a Chaser occupying said guideway, a pair of partial Cylindricalrecesses on opposite sides of the guideway, a pair of rotative abutments0C- cupying said recesses, said abutments being provided with shoulderswhich engage a V -shaped shoulder on the Chaser in a direction to takethe thrust nearly through the Center of the abutment, Compressionsprings occupying recesses in the frame and bearing 120 Cylindricalrecesses on opposite sides of the 130 guideway, a pair of rotativeabutments oc- Cupyingsaid recesses, said abutments being provided withshoulders which bear against a V-shaped shoulder on' the Chaser in adirection nearly normal thereto, Compression springs occupying recessesin the frame' and bearing against shoulders on the abutments forswinging the Chaser-engaging edge toward the Chaser, and an actuatingbar Carried by the frame alongside of the Chaser,`

said bar having a V-shaped head adapted to engage oblique shouldersV onthe abutments, the inner end of said bar being provided with anon-cutting edge adapted to occup the thread Cut by the Chaser. Y

17. A device for Cutting tapered threads, Comprising a frame, a movablymounted thread-Cutting Chaser therein, a movably mounted non-Cuttingfollower in the frame adapted to engage the thread Cut by the Gopies ofthis patent may be obtained for Chaser, and means Carried by the frameand Controlling the position of the Chaser and adapted to be moved bythe follower but immovable by the Chaser itself.

18. In a die stock, the VCombination of a rotary frame, a set of Chasersradially mounted in the frame and having threadcutting teeth, a set offollowers movably mounted in the frame, there being one followerv foreach Chaser and the follower being provided with an edge adaptedtoengage the thread Cut by the Chaser without itself Cutting, a series ofmovable abutments Carried by the frame and Controlling the position ofthe Chaser, and means whereby said abutments may be moved by thefollowers but Cannot be moved by thechasers.

In testimony whereof, I hereunto affix my signature.

IRA W. NONNEMAN.

five cents each, by addressing' the Commissioner of Iatents, Washington,D. C.

